Items won't delete when I try to remove them from a collection/move to trash

Hello,
When I attempt to remove an item from my collection or move an item to trash in Zotero the item doesn't get deleted. I followed the instructions re Debugging output logging and received the following code D1906455172. What is the next step?
  • That seems to show you in the middle of adding thousands of items to a collection. Did you perform some huge operation previously?

    If you didn't do that on purpose, you should restart Zotero and try again.
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